Email Authentication (SPF/DKIM/DMARC)
Three DNS records that let a receiving server confirm that mail claiming to come from a domain really does. SPF lists the servers allowed to send for it, DKIM adds a signature that exposes tampering, and DMARC tells receivers what to do when the checks fail. Start DMARC at p=none, read the reports, then tighten to quarantine.
Growth without the headcount.
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